On a Recent Sale,Boeing Allowed British Airways to Pay Either

On a recent sale,Boeing allowed British Airways to pay either $18 million or £10 million.

A) At the due date,British airways will be indifferent between paying dollars or pounds since they would of course have hedged their exposure either way.
B) Boeing has provided British Airways with a free option to buy $18 million with an exercise price of £10 million.
C) Boeing has provided British Airways with a free option to sell up to £10 million with an exercise price of $18 million.
D) all of the options